This is the lower spring on '94 -'96.
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The double spring is on '97 & '98 models. I've never heard of a retrofit but it wouldn't be difficult, just expensive.
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what year is that pic from? on my 1996 there are only attachments gor te spring in the front of the pic with the plastic clips the spring i got just has bent over spring ends and i cant figure out where it goes. my vision stinks so i cant see or feel any holes to put the hook ends in